Unfortunatley just about all artwork you see in stickers with a few exceptions is stolen artwork. It would be a full time job heck several full time jobs, to go thru every thing and point it out.. and even then I think the real owner of the item has to email or contact IMVU before they'll take down stuff.
I know I've seen art by a number of other furry artists splashed all over the place. I've contacted a few of them like Xian Jag, Megan Giles and others I know personally.. but I haven't checked back lately to see if the items were taken down. The rest like all the golden wolf stuff.. there's just too much there to deal with and I don't have the desire to make enemies.. at least much of the stolen art work still has the artist's watermark on there so it ends up being 'free advertising' to a small extent.
imperfect solutions for imperfect world. =(